I'm with Lin, rooted my pineapple tops by just sticking them directly into a pot of soil. With as many roots as you have already, I'd think you could go there, too. Might want to give it a "greenhouse" to increase the humidity around it by covering it with an inflated plastic bag until you see new leaves growing. Keep it warm and in good light.
Have you thought ahead to what you want to do with this plant? They get pretty big before they produce a fruit - mine's 3ft. across, 30in. high and VERY prickly! It also takes 2 years for a new plant to flower, even down here in Florida. (that's when we have a normal warm winter)
